Pneumatic pump.



E. L. & J. S. ARNOTT.

PNEUMATIC PUMP. APPLICATION HLED OCT. 22, 1915- Patented A11 14 ,'1917.

' taken on the line 2 2 of Fig. 1

lower member may be extended laterally to EUGENE I. ARNOTT AND JOHN S.

ARNOTT, OF GREENFIELD, OHIO.

PNEUMATIC PUMP.

Application filed October 22 To all whom it may concern:

Be it known that we, EUGENE L. ARNoTr aIlCl'JOHN S. ARNo'rT, citizens ofthe United States, residing at Greenfield, in the county of Highland andState of Ohio, have invented certain new and useful Improvements inPneumatic Pumps; and we hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, which form part of this specification.

This invention relates to oil cans of the type in which air pressure isused to force out the liquid through a discharge tube.

The objects of the invention are to provide an air pump of improvedconstruction with means for holding the cloth or dia phragm in positionand to prevent the edges thereof which are clamped between metal partsfrom slipping out, and at the same time to prevent the tin or othermetal parts between which the diaphragm is secured from being puncturedso as to permit the air to escape.

The invention will first be hereinafter more particularly described,with reference to the accompanying drawings, which are to be taken as apart of thisspecification, and then pointed out in the claims at the endof the description.

In said drawings, Figure 1 is a plan view of a broken-away portion of apneumatic pump or air compressor adapted to be mounted upon a can orvessel containing the' oil, and by manipulation of the diaphragm toforce the oil from the can by atmospheric pressure;

Fig. 2 is a vertical sectional elavation,

Fig. 3 is a detail sectional view illustrating our improved method ofsecuring the edges of the diaphragm between the top and bottom membersof the pump chamber.

Referring to said drawings, in which the same reference letters are usedto denote corresponding parts in different views, the letters A and Bmay denote the upper and lower members of the pump chamber, of Idish-like form made of tin or other suitable} metal, and placed one uponthe other with their concave sides facing and the marginal portion or"flange of one resting upon a similar marginal portion or flange of theother member. If desired the margin of the :c'orm the top or cover or anoil can, as indi- Specification of Letters Patent.

Patented Aug. 14, 1917. 1915. Serial No. 57,304.

cated in the drawings; or the pump may be secured upon the body' of acan or other vessel of any convenient size or shape, in the mannerindicated in our Patent No. 864,284, dated August 27, 1907, for apneumatic oil can. With the pump chamber, between the members A and B isplaced a flexible diaphragm C, in which is fitted a check valve D,adapted to permit the introduction of air on the upward movement of thediaphragm and to force the air into the can through a similar checkvalve E in the lower member, or top of the can; the pump being providedwith an operating lever F, pivotally supported thereon at one end andconnected by a rod f with the diaphragm through an opening in the topmember A or cover of the pump. The diaphragm C may consist of cloth orother suitable flexible material and is secured in position by havingthe marginal portions or edges thereof clamped between the edges of thetop and bottom members of the pump, as shown more clearly in Figs. 2 and3; said edges being soldered or otherwise secured together, whereupon aseries of indentations a are formed in one marginal flange preferablythe margin of the upper member so as to aid in holding the cloth ordiaphragm firmly in place and prevent the edges thereof from slippingout. These indentations do not pierce or perforate the tin or materialof which the members A and B are formed, for if punctured the air mightescape. A series of protuberances are thus formed on one of the clampingmembers, which will take into without piercing the edges of the clothand thus firmly bind said edges between the clamping members in suchmanner as to prevent the escape of air by puncturing the tin or materialof which the clamping members are formed.

Having thus described our invention, {what we claim as new and desire tosecure by Letters Patent of the United, States is:

1. In a diaphragm pump, a lower casing member of dish-like form having acheck valve therein and an integral annular marginal flange, incombination with an upper casing member of like form having a similarannular flange and a central opening,

and a flexible diaphragm placed between and separating said casingmembers having its marginal portion clamped between the marginal flangesof said casmg members; one of said flanges having impressed thereinaseries of imperforate indentations which press upon without piercing thematerial of said diaphragm, whereby the diaphragm is prevented fromslipping out from between the flanges while an air-tight connection isformed therebetween; said diaphragm having a check valve therein and anoperating lever connected therewith.

2. A diaphragm pump comprisingupper and lower casing members consistingof metallic plates of dish like form having an nular marginal flangesand placed one upon the other with their concave sides facing, the lowermember having a check valve therein, a flexible diaphragm placed between said plates and having its marginal portion clamped between saidflanges; said diaphragm having a check valvetherein and one of saidflanges having impressed therein a series of protuberances which pressupon without piercing the material of said diaphragm, whereby the latteris prevented from slipping out from between said flanges while anair-tight connection is formed therebetween, an operating leverpivotally mounted on the upper casing member, and a rod conne'ctingsaidlever and said diaphragm through an opening in the upper casing member,substantially as described.

Intestimony that we claim the foregoing as our own, we aflix oursignatures in presence of two witnesses.

' EUGENE L. ARNOTT.

JOHN S. ARNOTT. Witnesses:

GHAs. MoAL'r; PEARL BORDENL Copies of this patent may be obtained forfive cents each, by addressing the Commissioner of'latents,

Washington; D. G.

